Revit API & Add-in Development in C#
We build Revit add-ins that automate modelling, documentation and data tasks, with clean ribbon tools and dockable panels your BIM team will actually use, and code that is ready for new Revit releases.
Professional Revit add-ins, built the right way
The Revit API lets .NET code read and change almost every element in a model: walls, floors, families, parameters, views, sheets, schedules and more. Add-ins are loaded through .addin manifest files and appear as external commands and applications on the Revit ribbon. Dynamo and pyRevit are useful for quick scripts, but a compiled add-in is the best choice for tools that must be fast, stable and easy to deploy across a company.
ENGIMANDI writes Revit add-ins in C# with proper transaction handling, element filtering for performance, extensible storage for custom data and updaters for automatic reactions to model changes. Revit 2025 moved the API to .NET 8, so we plan projects that can target both older and newer Revit versions from one codebase. For web and server scenarios, we use Design Automation for Revit on Autodesk Platform Services.
See our Revit API automation guide and Revit API for BIM automation.
What you get
- External commands & applications
- Ribbon tabs & dockable panes
- Element creation & editing
- Parameters & extensible storage
- Dynamic model updaters
- Multi-version builds
- Design Automation for Revit
- Installer & source code
Revit add-ins we build
Automation across modelling, documentation and data.
Modelling Tools
Place, align, copy and adjust elements by rules, grids, levels or imported data.
Documentation Tools
Views, sheets, tags and schedules created and arranged automatically.
Parameter Tools
Bulk parameter editing, Excel round-trip and shared parameter management.
QA & Checks
Model checks for naming, parameters, warnings and standards with fix actions.
Integrations
Connections to databases, ERP, cost systems, ACC and web services.
Cloud Automation
Design Automation for Revit for batch processing and web-driven model generation.
Revit development stack
Autodesk-native APIs and tools.
Typical projects
- Company Revit toolbar with 30 productivity tools
- Sheet and view creation from an Excel sheet list
- Parameter manager with Excel import and export
- Opening and sleeve placement for MEP penetrations
- Upgrade of legacy add-ins to Revit 2025 and later
- Cloud batch export of IFC and PDF from ACC models
How we develop Revit add-ins
Discover
Workflows, standards and Revit versions.
Design
Tool behaviour and UI mock-ups.
Develop
C# add-in in short, demo-driven cycles.
Test
Real project models and performance checks.
Deploy
Installer, training and version updates.
Revit add-in questions
Should we use Dynamo or a Revit add-in?
Dynamo is great for quick, project-specific scripts. Add-ins are better for company-wide tools that need speed, a proper UI and controlled deployment.
Will our add-in work in Revit 2025 and later?
Revit 2025 moved to .NET 8, so older add-ins must be rebuilt. We upgrade existing add-ins and set up builds for multiple versions.
Can Revit run without a desktop?
Yes. Design Automation for Revit runs add-in code in the cloud for batch processing and web applications.
Does the add-in work with cloud worksharing on ACC?
Yes. Add-ins work with local and cloud workshared models, following Revit's worksharing rules.
Do we own the code?
Yes. You receive the full source code and documentation.